Transmitter
First Claim
1. A transmitter comprising:
- an input for receiving a signal;
gain control means for applying a first gain to the received signal;
first path means for providing a second, relatively high gain for said received signal;
second path means for providing a third, relatively low gain for said received signal;
transmitter means for transmitting a signal; and
control means operable, in use, to cause a received signal to pass through the gain control means and said first path means when a relatively high gain is to be applied to the received signal and to cause a received signal to pass through the gain control means and said second path means when a relatively low gain is to be applied to said received signal, wherein when a change is made from using one of said first and second path means to using the other of said first and second path means, the power of the signal transmitted by the transmitter varies by less than or equal to a predetermined amount;
and measuring means to provide a value indicative of the value of the power level of the signal transmitted by the transmitter means, said measuring means providing a reference value when a signal passes through said second path means and the gain of the gain control means has been set to a predetermined level, wherein the control means, when the measuring means provides the reference value when a signal passes through the first path means, causes a received signal to pass through said second path means.
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Accused Products
Abstract
A transmitter has an input for receiving a signal, gain controller for applying a first gain to the received signal, a first path for providing a second, relatively high gain for the received signal, a second path for providing a third, relatively low gain for said received signal, a transmitter for transmitting a signal and a controller to cause a received signal to pass through the gain controller and the first path when a relatively high gain is to be applied to the received signal and to cause a received signal to pass through the gain controller and the second path when a relatively low gain is to be applied to the received signal. When a change is made from using one of the first and second paths to using the other, the power of the signal transmitted by the transmitter varies by less than or equal to a predetermined amount.
82 Citations
30 Claims
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1. A transmitter comprising:
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an input for receiving a signal;
gain control means for applying a first gain to the received signal;
first path means for providing a second, relatively high gain for said received signal;
second path means for providing a third, relatively low gain for said received signal;
transmitter means for transmitting a signal; and
control means operable, in use, to cause a received signal to pass through the gain control means and said first path means when a relatively high gain is to be applied to the received signal and to cause a received signal to pass through the gain control means and said second path means when a relatively low gain is to be applied to said received signal, wherein when a change is made from using one of said first and second path means to using the other of said first and second path means, the power of the signal transmitted by the transmitter varies by less than or equal to a predetermined amount;
and measuring means to provide a value indicative of the value of the power level of the signal transmitted by the transmitter means, said measuring means providing a reference value when a signal passes through said second path means and the gain of the gain control means has been set to a predetermined level, wherein the control means, when the measuring means provides the reference value when a signal passes through the first path means, causes a received signal to pass through said second path means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
a plurality of amplifiers arranged in series; and
said second path bypasses at least one of said plurality of amplifiers.
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24. A transmitter as claimed in claim 1, wherein said reference values comprise a range of values whereby when switching occurs between power levels hysteresis occurs.
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25. A transmitter as claimed in claim 24, wherein said range of values may vary depending on the terminal operation mode.
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26. A transmitter as claimed in claim 1, wherein said transmitted signal comprises speech signals or data signals or a combination of speech and data signals.
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27. A transmitter as claimed in claim 24, wherein when said transmitted signal comprises speech signals the power level of said transmitted signal is relatively low.
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28. A transmitter as claimed in claim 26, wherein when said transmitted signal comprises data signals or a combination of speech and data signals the power level of said transmitted signal is relatively high.
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29. A transmitter as claimed in claim 1, when incorporated in a mobile station.
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30. A method for controlling gain of a transmitted signal comprising the steps of:
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receiving an input signal;
applying a first gain to the input signal;
causing a received signal to pass through a first path providing a second, relatively high gain when a relatively high gain signal is required and causing a received signal to pass through second path means providing a third, relatively low gain when a relatively low gain is required;
providing a value indicative of the value of the power level of the signal transmitted;
providing a reference value when a signal passes through the second path means and the first gain has been set to a predetermined level; and
controlling the gain applied to the input signal so that when a change is made using one of the first and second paths to using the other of said first and second paths, the power of the transmitted signal varies by less than or equal to a predetermined amount, wherein when the reference value is provided when the signal passes through the first path means, the signal is caused to pass through the second path means.
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Specification